Scheduled Maintenance: XenServer Upgrade

In order to support new operating systems, deliver new features and in preparation for a forthcoming storage migration, we will be upgrading the XenServer hypervisor that powers our primary site virtual server environment at this time.

All virtual machines will require rebooting to complete the upgrade, but disruption should be restricted to a few minutes as virtual machines will be migrated between hosts as the upgrade progresses. We apologise for any inconvenience caused.

Update: This maintenance has been postponed to a future date due to a hardware issue that it has not been possible to recover.